Boring-machine.



J. KINDLBBERGER E G. GARRETSON.

` BORING MACHINE.

APPLIOATION FILED DBO. 10, 1907.

924,473. Patented June 8,1909.-r

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nu: NoRRls PETERS ca., wAsnmGTaN. D. c.

J. KINDLEBERGER &:` G. 'GARRETSON.

' Boum@ MAOHINE.

nummer rum: 1120.10, 1907.

@ l mi with waas Patented June 1909.

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srnrns rar Er ernten JEFFERSON KINDLEBERGER AND GEORGE GARRETSON, OF'SANDEGO, CALIFORNIA; SAID KINDLEBERGER ASSI'GNOR TO' SAID GARRETSON.

BORING-MACHINE.

Application filed December 10, 1907.

Specification of Letters Patent.

To all whom it may concern:

Be it known that we, JEFFERSON KrNDLE-- BERGER and GEORGE GAREETsoN,citizens of the United States, residing at San Diego, in the county ofSan Diego and State of California, have invented new and usefullmprovements in Boring-Machines, of which the following is aspecilication.

This invention is an improved boring machine especially adapted forboring one or a pair of holes simultaneously through an elevated timbersuch as an overhead joist or rafter, wall, door or window frame or otherstructure for the purpose of enabling electrical conductors, insulatorspipes or the like to be passed through such articles or structures andthe said invention consists in the construction, combination andarrangement of devices hereinafter described and claimed.

Referring to the drawings, Figure 1 is a front elevation of a boringmachine constructed in accordance with this invention. Fig. 2 is a sideelevation of the same. Fig. 3 is a top plan view of the same. Fig. 4 isa longitudinal sectional view of the same on a plane intersecting thetubular sleeve which rotates one of the boring bits. Fig. 5 is avertical transverse sectional view ofthe same taken on plane indicatedby the line 5-5 of Fig. 3. Fig. 6 is a detail elevation showing amodiiication. Fig. 7 is a top plan view of the same. Fig. 8 is a detailelevation of one of the journals of the feed shaft, the latter beingshown in cross section. Fi 9 is a detail sectional view of the frame, sowing the upper end of the standard attached thereto. Fig. 10 is adetail sectional view of one of the boring bit spindles.

A frame 1 is provided, which is here shown as comprising a pair ofbracket arms 2, a cross bar 3, which connects the rear ends of suchbracket arms, a substantially V-shaped cross bar 4, which connects suchbracket arms at a suitable distance from the outer ends thereof, and ahub or core 5 which connects such V-shaped bar 4 Iand the bar-3together. The bracket arms 2 are provided at their lower inner sideswith inwardly projecting flanges 6, which are provided with verticalthreaded `openings to receive screws 7 a. The bars or arms 2 areprovided at their outer ends with downwardly extending portions 7, oninner sides of which are secured lates 8, by means of bolts 9. Saidplates liave shoulders 10, which project beyond the said portions andareprovided on their upper sides with spurs 11. The core or hub 5 n `isprovided on its under side with a downwardlyextending web 12 and ahollow cylindrical portion 13l which forms a socket for the reception ofthe upper end of the standard 14, and is provided with a wedge shapednotch 13a. Such standard comprises the upper cylindrical section 15 andthe lower tubular section 16, in which the lower portion of such uppersection is telescopically fitted so that the length of such standard maybe varied at will. Set screw wheels 17 are provided to secure thesections 15 and 16 together and the saidv section 16 is provided with anadjustable collar having a shaft 18 on lwhich is mounted a drivingsprocket wheel 19,y which has a hand crank 20, whereby it may berotated.

The upper section of the standard 14 is provided with a collar 14u whichbears under the cylindrical portion 13 of the frame, is provided withset screws 14lo whereby said collar is secured iirmly on said standard,and said collar isprovided on its upper side With a wedge shaped point14C which enters the notch 13a which serves to prevent the standard fromturningas will be understood.

The cross bars 3, 4, of the frame are pro vided with bearings 21,'fortubular shafts or sleeves 22, which are disposed parallel with eachother at a suitable distance apart, and are respectively provided Withsprocket wheels 23. Each of said tubular shafts is provided in one sidewith a longitudinally disposed spline 24, which extends from end to endthereof, and in each of said tubular sleeves is itted a cylindrical,longitudinally movable spindle 25, which is provided with a longitudinalway or groove 26, in one side, engaged by the said spline or key, andwith rack teeth 28 on its outer side which extend circumferentiallyaround the same. Housings 48 are secured on the portions 2 and 4 of theframe 1, by means of screws 49, and bear upon the upper sides of thespindles 25 to prevent said spindles from moving upwardly and becomingdisengaged from the feed pinions hereinafter described; The bits 29 maybe of any suitable construction. The spindles 25 have outer ends reducedand split as at 50 to enable the bitsto be readily inserted therein, thebits being provided with cross pins 51 for insertion in the splits orslots formed in the spindles to prevent the bits from turning in thespindles, and the said reduced portions are exteriorly threaded and areengaged by collar nuts 52 which bear against the outer sides of thecross pins and ret-ain the latter and hence also the bits in place.

An adjustable collar 3l is secured by set screw wheels on the uppersection 15 of the standard and is provided with a stub axle 32, on whichis mounted an idler pulley 33. An endless sprocket chain 34 connects thesprocket wheels 19 and. 23, and has a bight 35, which extends betweensuch sprocket Wheels 23 and is engaged by idler pulley 33. Said chain 34runs through a guide 30 with which the frame 1 is provided on one sideas shown in Fig. 3, said guide serving to prevent the chain from movinglaterally, and keeping it always in engagement with the wheels 23.

lt will be understood from vthe foregoing description and by referenceto the drawings that by turning the wheel 19, the chain 34 and wheels 23cause the tubular sleeves 22 to revolve and such sleeves by means of thespline connections between them and the spindles cause such spindles torevolve so as to rotate and operate the boring bits.

The feed shaft 36 is mounted in bearings 37 which are disposed on innersides of the bracket arms 2, above the flanges 6, bear on and areengaged by the screws 7, are adjustably connect-ed to such bars 2 forvertical movement and are provided with adjusting screws 38a. Hence byadjusting such bearings the shaft 36 may be vertically adjusted to causepinions 33 with which it is provided to engage the rack teeth of thelongitudinally movable spindles, so that when such feed shaft isrevolved such spindles are moved longitudinally and are caused to feedthe bits to the work, or to withdraw the same therefrom after completingthe boring, according to the direction in which such feed shaft isturned. Said feed shaft 36 has a sprocket wheel 39 which is engaged onits upper side by the sprocket chain 40. The cord 41 is attached to oneend of such chain and depends therefrom, and a cord 42 is attached tothe other end of said chain, depends therefrom, and is provided at itslower end with a handle 43. A coiled retractile spring 44 has its upperend attached to the lower end of the rod 41, and its lower end attachedas at 45 to the section 16 of the standard. The tension of the saidspring causes the chain 4() by coaction with the sprocket wheel 39 toturn the feed shaft 36 in the required direction to withdraw the bitsfrom the work. The standard enables the machine to be set at any desiredheight from the floor or other base, and the lower outer ends of thebracket arms 2 by bearing against the side of the timber or structure tobe bored enable the boring bits to be directed and the boring mechanismto be held while operating. The plates 8 bear under such timber orstructure and the studs pierce the same to a su l'licient depth bykicking base of stafl` along the floor till secure to prevent the formerfrom being casually de tached from the timber or structure.

Having put the machine in place as above. described and as shown in Fig.2, the operator turns the crank 2() to cause the boring bits to berevolved by means hereinbefore described and at the same time drawsdownwardly on handle 43 thereby causing thi` feed shaft to revolve inthe required direction to move the bits longitudinally to the work.Having performed the boring, the operator by releasing the handle 43enables the spring 44 to cause the boring bits to be retracted.

To strengthen the construction of the frame the bracket arms 2 havetheir inner sides connected together by a transversely disposed rod 46,a bar 47 connects the hub 5 with said rod, and is provided with openingsthrough which the chain 40 extends.

In the modified form of the frame shown in Figs. 6 and 7 there isprovided a collar 53 to engage the standard 14, and a pair of bars 54which are inclined, converge toward each other in one direction, havetheir converging ends connected together by a bolt 55, are connected tothe said collar 53 by screws 56 and are connected together near theirfront ends by a cross bar 57, said bars are provided with forwardlyextending shoulders 5S to bear under the beam, studs 59 to enter theunder side of the beam and connect the frame securely thereto, and saidbars are further provided with upwardly extending arms 60 which may beadj ustably connected to the depending portion 7 of the arms 2 of theframe 1 by bolts 61 which engage openings in said arms 60 andappropriate adjusting o enings 9 in said depending portions 7. It willbe understood that by the use of these bars 54 the frame may be sosecured to the work as to cause the boring bits to bore holes at anydesired distance from the lower side of the work.

At the lower end of the standard 14 is an outwardly projecting arm 62which has a downwardly extending stud 63 at its outer end which may beforced into the floor by the foot of the operator to secure the standardto the fioor so that there is no danger of its becoming displaced whilethe machine is at work.

Having thus described the invention, what we claim as new and desire tosecure by Letters Patent is l. An overhead boring machine comprising aframe, a supporting standard therefor, a shaft mounted on the frame,means for rotating said shaft, a spindle connected to said shaft forrotation therewith and longitudinal movement relative thereto, saidspindle having circumferential rack teeth, a

feed shaft mounted in said frame and having a inion engaging' said rackteeth, a sprocket W eel on said feed shaft, a sprocket chain passingover said Wheel, a spring connected with said chain and operating torevolve said feed shaft in one direction and an operating connectionassociated With said chain for causing the latter to act on the feedsprocket Wheel and revolve the feed shaft in the reverse directionagainst the tension of said spring.

2. An overhead boring machine embodying a head frame, a standard forsupporting said frame at an elevation7 boring means carried by said headframe', and a Work engaging bracket embody' g a shoulder projecting in aplane parallel to the axis of the boring means and having an upstandingWork engaging spur which extends at right angles to the axis of theboring means.

In testimony whereof We aflX our signa- 20 tures in resence of twoWitnesses.

J FFERSON KINDLEBERGER. GEORGE GARRETSON. Witnesses:

JN0. P. BURT, M. C. TURNER.

